Air-pump.



No. 775,885. v PATENTED NOV. 22, 1904. G. L. BENNETT.

AIR PUMP.

APPLICATION FILED FEB.B,1904.

NO MODEL.

IINTTED STATES Patented November .2323, 190d.

GEORGE Ii. BENNETT, OF CHICAGO, ILLINOIS.

AIR PUMP.

SPECIFICATION forming part of Letters Patent No. 775,885, dated November 22, 1904.

Application filed February 8, 1904;. Serial No. 192,713. (No model.)

To (ti/Z 1071/0772 ritntmy concern:

Be it known that I, GEORGE L. BENNETT, a citizen of the United States, residing at Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Air-Pumps,of which the following is a specilication.

My invention is related to gasometers and air-compressors used in the practice of surgeons and dentists to administer anesthetics by means of compressed air, also in connection with an atomizer or a blowpipe in mechanical dentistry.

It is often necessary to quickly reinflate the bell during an operation of any character, and when using the old style of gasometers fitted with automatic inlet valves or cocks they have i been found to consume too much time in manipulating them, and it is often necessary to change the location of the gasometer from one room or place to another.

The objects of my invention are to provide a combined handle and valve fixed to the top of the floating bell in such manner that when the bell is lifted to inflate it the valve will be opened at the same instant.

I attain these objects by a mechanism illustrated in the accompanying drawings, in which- Figure 1 is a vertical sectional view of a gasometer, showing my improvement fixed to the crown of the bell in section. Fig. 2 is a top view of the valve and handle. Fig. 3 is a top view of the valve-tube, showing one of the guide-bars.

Similar letters refer to similar parts throughout the several views.

In the drawings is shown a gasometer having a floating bell A, a liquid-tank A, an inner chamber A water-space a, and dischargepipe B. The arrows indicate the direction the air takes to escape through the central tubeB in the inner chamber.

A stud 5, having a tenon 7) on its upper end, is fixed to the crown of the bell A by a nut Z and screw 6 The handle a is mortised at it vi to lit the tenon b. The ends of the mortise are out at an angle to permit the handle to he moved. up and down on the pivot-pin 7:. The outer end of the handle is fitted witha thumbscrew 0. The valve-tube f is fixed in the crown of the bell and is provided with guidebars 1. The valve on is fixed to the stem 1) by a nut and screw 02 The top of the valve stem is provided witha disk head (i. A eoilspring (2 is placed around the stem between the guide-bar and the head. The stem is adapted to slide in the orifices in the guide-bars.

In operation, the hell being deflated, it is intended to be lifted by the handle simultaneously with the opening of the valve. The operator grasps the handle and. lifts on it. This causes the screw 0 to come in contact with the head of the valve-stem, pushing it downward, opening it, and holding open till the bell is sufficiently inflated. The handle being released will fall back to its normal position. The spring assisted by the air-pressure will close the valve, and the bell will remain up inflated. When it is necessary to deflate the bell, the operation should be reversed.

Then it is required to move the gasonieter from place to place, the bell may be strapped to the tank or otherwise secured, the thumbscr-ew being turned out so that it will not come in contact with the valve-head, when it may be lifted by the handle and carried about.

Having described my invention and its operation, what I claim as my invention, and wish to secure by Letters Patent, is-- The combination in an air-pump of the movable handle having a mortise adapted to receive a tenon, the thumb-screw in the outer end of said handle, the stud having a tenon adapted to fit in said mortise, the handle being pivoted to said stud, the stud fixed to the crown of the floating bell, the valve-tube having guide-bars provided with means for receiving a slidable valve-stem, said valve-tube fixed to the crown of bell, the outwardly-closing valve having a stem carrying a disk head adapted to engage the thumb-screw, the valvestem provided with an actuating-spring, the bell adapted to float in the liquid-tank substantially as described.

GEORGE L. BENNETilT.

Witnesses:

M. IQ. Genes, (J. C. Eisner. 

